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4x4: easy intermediate hard challenging expert
6x6: easy intermediate hard challenging expert
8x8: easy intermediate hard challenging expert
9x11: easy intermediate hard challenging expert
9x17: easy intermediate hard challenging expert

Kakuro is like a crossword puzzle with numbers. Each "word" must add up to the number provided in the clue above it or to the left. Words can only use the numbers 1 through 9, and a given number can only be used once in a word. Every kakuro puzzle has one and only solution, and can be solved through logic alone.

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Also try sudoku and hitori
 
 
7
 
38
  
 
19
 
20
    
 
12
 
14
7
 
10
 
 
32
17
24
11
 
22
13
 
33
 
 
39
 
9
 
23
5
21
6
11
 
  
7
20
11
10
3
 
36
9
 
18
 
15
7
 
10
 
 
8
21
32
18
16
7
 
8
15
6
11
14
 
13
26
 
42
  
 
21
20
10
9
 
6
39
 
6
 
9
 
13
19
 
25
11
10
15
 
11
20
  
 
 
8
33
9
 
3
39
 
4
 
8
 
  
16
 
6
 
00:00
You are playing 9x17 challenging puzzle 18251

Start over, and play another kakuro of this size and difficulty.


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